Design

Modern R development practices emphasizing tidyverse patterns (dplyr 1.1 and later, native pipe, join_by, .by grouping), rlang metaprogramming, performance optimization, and package development. Use when Claude needs to write R code, create R packages, optimize R performance, or provide R programming guidance.

Comprehensive project architecture analyzer that identifies technology stacks, build tools, and architectural patterns. Use when you need to quickly understand a project's structure, dependencies, and technical configuration. Provides analysis for frontend frameworks (Vue/React/Angular), Node.js environments, package managers, TypeScript usage, linters, and architecture patterns.

実装前にノウハウを確認。Tauriコマンド追加、serde、WebSocket通信、設定項目追加、UI/オーバーレイ実装、セキュリティ関連の作業時に自動的にチェックリストを提供する。

Implement Stripe payment processing for robust, PCI-compliant payment flows including checkout, subscriptions, and webhooks. Use when integrating Stripe payments, building subscription systems, or implementing secure checkout flows.

Use when preparing to fine-tune an LLM for multi-turn conversations, before generating any training data. Triggers - starting a fine-tuning project, need to define evaluation criteria, designing conversation data generation.

Design system architecture with components, data flow, and boundaries. Use for non-trivial features.

Plan and triage work into GitHub issues. Use when Codex needs to decide whether a new issue is required, describe the problem, outline high-level plans and goals, propose architecture, split large work into sub-issues, add labels, and create a GitHub branch for each issue using gh.

Analyze and validate forms on web pages. Use when users ask to check form accessibility, verify form labels, audit input fields, check form validation, or analyze form UX. Detects missing labels, invalid input types, accessibility issues, and validation problems.

System architecture: modules, project structure, ADRs, and testing. Use when designing or reviewing systems.

Guide for choosing between Server Components and Client Components in Next.js App Router. CRITICAL for useSearchParams (requires Suspense + 'use client'), navigation (Link, redirect, useRouter), cookies/headers access, and 'use client' directive. Activates when prompt mentions useSearchParams, Suspense, navigation, routing, Link component, redirect, pathname, searchParams, cookies, headers, async components, or 'use client'. Essential for avoiding mixing server/client APIs.

MANDATORY for ALL JavaScript code! PROACTIVE - Use when writing JavaScript/TypeScript code. Requires JSDoc comments with @skill-verified tag for all functions. Essential for code documentation and IDE support.

Create beautiful infographics based on the given text content. Use this when users request creating infographics.

This skill generates comprehensive chapter content for intelligent textbooks after the book-chapter-generator skill has created the chapter structure. Use this skill when a chapter index.md file exists with title, summary, and concept list, and detailed educational content needs to be generated at the appropriate reading level with rich non-text elements including diagrams, infographics, and MicroSims. (project, gitignored)

Guide for implementing Obsidian knowledge management - vault operations, plugin development, URI scheme automation, markdown extensions, and Local REST API integration. Use when working with Obsidian vaults, creating plugins, automating note workflows, querying notes via API, or implementing knowledge graph features.

Helps turn app ideas into shippable MVPs with opinionated guidance on scoping, tech stack (Next.js, Supabase, Vercel), and avoiding feature creep. Use when the user wants to plan an MVP, create a PRD, generate Claude Code prompts, scope features, make product decisions, or needs help staying focused on shipping. Triggers include "plan this app", "help me scope this", "create a PRD", "what should I build first", "generate a Claude Code prompt", or any request to turn an idea into something shippable.

Build content-focused websites with Eleventy (11ty). Use when creating templates (.njk, .liquid), working with data cascade, collections, or deploying static sites.

Guide users through Slovak VAT Act 2025 compliant vehicle registration with VIN validation

Use when Python code runs slowly, needs profiling, requires async/await patterns, or needs concurrent execution - covers profiling tools, optimization patterns, and asyncio; measure before optimizing (plugin:python@dot-claude)

A production-ready pattern for integrating AI models (specifically Google Gemini) with automatic fallback, retry logic, structured output via Zod schemas, and comprehensive error handling. Use when integrating AI/LLM APIs, need automatic fallback when models are overloaded, want type-safe structured responses, or building features requiring reliable AI generation.

Domain-specific configuration profiles for learning resource creation. Defines search strategies, special fields, terminology policies, and content structures for different academic domains: technology, history, science, arts, and general. Use when researcher or writer agents need domain-adapted behavior.